Regrinding and reboring machine



April 13,1926; 1,580,379

J. LOCKEN REGRINDING AND REBORING MACHINE Filed July 30, 1923 2 Sheets-Sheet 1 N INVENTOR t: a g flacfieib. s BY B; I

A TTORNE YS Patented Apr, 13, 1926'.

JOHN LOCKEN, orioomszrocmmmnnsorn.

mam-pagan eeneeme MMPHINE- Application filed July so, 1933. s l; noqeaeg'zl To all whom it may concern:

Be it known that I, JO N LocKEN, a citi-- V zen of the United States; and a resident of Comstock, in the county of Clay and State of Minnesota, have invented certainnew and useful Improvements in Regrindingand Reboring hiaohines, of which the following is a specification. w o

' Thislfinvention relates to a re-bori'ng and re-grinding machine and has for its object the provision of a device whichis ordinarily employed in re-boring but which may be readily converted into a device for re-grinding OPe TatiOnsf i Another object of the invention is the provision of a device which isv simple in construction and effective for alternate regrin ding and re-boring and which may be readilyand easily converted fromone to the other. 7 s

This invention will be best understood from a consideration of the following detailed description inview of the accompanying drawing forniing a part of the specification; nevertheless it is tobe understood that the invention is not confined to the disclosure, beingsusceptible of such changes and modifications which shall define :no materi a1 departure from the salient features of the invention as expressed in the appended claims. p In" the drawings r Figure 1 isv a longitudinal section of a device constructed according to my invennon. a i

Figure 2 is a fragmentary longitudinal section of a removable tubular-bearing sleeve forsupporting a re-grinding head.

Figure '3is a vertical section taken along the line -33 -of Figure 1 Figure 4 is a vertical section taken along theline 44 of F lgure 1.

Figure 5 is an end view partly in sectionv showing the adjustment of the shaft.- I

' Figure 6'is a view in detail of the removable connections'for the re-borin-g'shaft and the re-boring cutters. Figure 7 is a plan view of the closure cap for-the removablebearingtube Referring to the drawings, 1 designates a table having an elevated portion 2whichis hollowed out"longitudinally for receiving a removable tubular bearing sleeve or re-v boring shaft'3. Upon the portion 2 is mounted an electric motor 4' having the short end 5 of a shaftproj'ecting beyondthe same which isremovablyconnected with a driving shaft 6,; by means of an enlargement 7."

Uponthe shaft 6 and driven thereby is a pulley 8 which has a guidewav in its hub engaging a key 9 on the shaft Ofand by which the pulley is fastened to the shaft and rotated by said shaft ,but'i's permitted to move upon the same when desired.

Upon the inner end ofthe sleeve. 3 and where said sleeve isred'u'ced is secured the lower end of a racket 10. The lower end of the'bracket is enlarged as shown at'll,

and provided with a semi-circular socket engaging the reduced'end of the sleeve A clamping member 12 which is drawn to the member 11 by bolts locks the bracket to the end of the-sleeve. The upper end of the bracket is provided with'a yoke 13 having pins 14 projecting inwardly for 'engaging at diametrically; opposite points a groove 15 formed in the hub of the pulley 8Q Mounted upon the outer end of the table is a second bracket 16 having a yoke 17 with threaded pins 18 having a threaded engagemQ t-wi h perforations in the s aidyoke "for clamping the bearing 19 in position. The end of the shaft 6 is of cylindrical formation and is mountedin the'bearing 19. i A counter shaft 20 mounted 'centrally of the tubular sleeve Sis provided with ball bearings. 21 and 22 of thedouble rowtype for supporting the shaft centrally of the hollow sleeve 3. A third ballbearing 23 is located on the inner end of the counter shaft and said shaft 7 at this point has rigidly mounted V thereon a pulley 24 driven by a-fbelt 25 which is connected With theypulley 8 A cap closure 26 (shown more particularly in Figure 7) is bolted to the outer end of the sleeve and engages the bearing 23 to prevent the loss of lubricant from the hollow. sleeve.

Shoulders 27 formed in-the sleeve 3 engage the respective bearings 21; and 22 to prevent slippage of the same. Thecap closure/26 likewiseisada'pted to lock a curved bracket member 28 to the end of the sleeve'B.

'Afrod 29 has its inner end swiveled in a perforation in the freeend of the bracket 28, and is adapted to feed the grinding head into anengine cylinder which isbeing reground. f A second shaft 30 is mounted in the outer end of the hollow'sleeve 3 and has a remov-.

able connection with the countershaft 20,'

the connection comprising an enlarged portion 31 with a squared passage which r ceives the squared end of the shaft 20. Screwed upon the outer end of the sleeve 3 is a second sleeve 32 alined with the sleeve 3 and providing a bearing for the re-grind ing head shaft 33. A grinding head 34 is mounted on the outer end of the shaft and abutting the end of the conical bearing A bushing 36 is mounted in the bearing 35.

The conical bearing is adjustable as shown more particularly in Figure having a screw 37 so that when the bearing is turned the grinding head as may be located in eccentric relation with the shaft and thereby provide for re-grinding the larger bores in cylinders. The scale 38 determines the depth of the boring.

A yoke 39 formed at the end of the table 1 is adapted for supporting the work operated on. It'will be noted that not only the shaft and the re-boring section at the end of the tubular sleeve 3 are removable from the table but the sleeve 3 is bodily removable and carrying with it all the operating parts located therein as a unitary structure by loosening the bolts of the clamping member 12 and by removing thecap 26.

A member 40 connects the shaft 30 with the grinding head shaft 33. The inner end of the shaft 33 is provided with an enlargement 41 having a squared passage therein adapted to receive the squared end of the shaft 42 formed integrally with the connecting member 40. The member 40 is pro-- vided with a squared passage adapted to receive the squared end of the shaft 30. By this means a flexible connection is provided between the shaft 30 and the shaft 33 so that when the adjustment is made through the screw 37 no strain will be thrown upon the shaft 30 when rotating. A sleeve 43 spaces the roller bearings 22 from the roller bearing 23 mounted within the sleeve 3.

As shown in Figure 6 a connection 32 is provided which is adapted to be screwed on the threaded portion 45 of the shaft 3 by means of the threads 45 formed on the inner wall of a recess in the member 32". Said member is provided with a threaded reduced portion a upon which the cutter heads for the re-boring operation are screwed. W hen the connection 32 is placed on the end of the sleeve 3 the bearing sleeve 32, together with the connection 40 and shaft 42 and related parts connected with the grinding head 34, are removed. A worm gear 4:6 mounted upon the end of a drive sleeve is adapted to engage the worm f? on sleeve 3 for rotating said shaft at about 36 revolutions per minute when the device is employed for re-boring. For regrinding the motor 4: operates shaft 6, belt 25 and shaft 20.

A hand wheel 43 is adapted to drive the rod 29 inwardly and cause sleeve 3, together with the bracket 10 and pulley S to be move inwardly for moving the regrinding head 3% at a predetermined speed into the work which is being operated on. The hand wheel is likewise operated for moving the shaft 3 inwardly when the device is used as a re-boring machine for moving the cutter heads into a cylinder On the face plates 39 the wor is adapted to be clamped in the usual manner. It will be noted that both sleeve 3 and shaft 20 may be operated simultaneously but at clifferent speeds. The re-grinding shaft 20, together with the head, is adapted to be rotated at approximately 5500 revolutions per minute. The shaft 30 revolves only the grinding wheel at while the sleeve 3 is employed in revolving the grinding head within the cylinder when the grinding head is in an oi'fset position according to the adjustment shown in Figure 5 so that it may follow the cylinder walls of any sized bore.

That I claim is:

1. In a re-grinding and re-boring machine, a table, a tubular bearing member extending longitudinally of the table, a shaft extending longitudinally of and having bearings in the tubular member, a second shaftremovably mounted in the tubular member and removably connected with the first mentioned shaft, driving means mounted on the table, a shaft removably mounted on the table and rotated by the driving means, operative connections between the last mentioned and the first mentioned shafts, a bracket mounted on the inner end of the tubular bearing member, a cap for closing the inner end of said bearing member and secured to said end for aiding in looking the bracket in position, said bracket adapted to support the driving connection between the driving shaft and the first mentioned shaft in position. 7

2. In a re-grinding and re-boring machine, a table, a tubular bearing member extending longitudinally of the table, a shaft extending longitudinally of and having bearings in the tubular member, a second shaft removably mounted in the tubular member and removably connected with the first mentioned shaft, driving means mounted on the table, a shaft removably mounted on the table and rotated. by the driving means, operative connections between the last mentioned and the first mentioned shafts, said operative connections comprising a pulley provided with a grooved hub slidably mounted on the driving shaft and rotatable therewith, a pulley on the first mentioned shaftoperatively connected with the pulley on the driving shaft, a bracket mounted on the inner end of the tubular bearing member and provided with a fork at its upper end having pins engaging the iii) groove in the hub of the first mentioned pulley for maintaining said pulley in a-linement with the pulley on the first mentioned shaft.

3. In a re-grindmg and re-bonng may chine, a table a tubular bearing member extending longitudinally of the table, a shaft extending longitudinally of and having bearings in the tubular member, a second 10 shaft removably mounted in the tubular meinberand removably connected with the first mentioned shaft, driving means mounted on thetable, a shaft removably mounted on the table and rotated by the driving means.

operative connections between the last men '1 tioned and the first mentioned shafts, and

a bracket removebly connected to the tubular member and providing a support for the last mentioned shaft. t

' JOHN LOOKEN. 

